Pneumatically-actuated tool



D. L. ouL'roN PNEUMATIGALLY ACTUATED TOOL 2 Sheets-Sheet med ocr, e, 1924 Dec. 13, 1927.

D. L. OULTON P1-JEUMATISALLY A 'GTUATED Toor..

Filed Oct. 6, 1924 2 Sheets-Sher. 2

if/ y /7- TUR/May:

TUR: a@ K f/l lll Patented Dec. 13, `.192'.7.

UNITED "STATES *PATENT OFFICE.-

rAoTURING'ooR-PORATION, A CORPORATION 0F VERMONT.

' rNEUMATroALLY-ACTUATED Toor..

f Appii'cation' inea october 6, i924. serial No. 741,784.

. My invention relates to that type o f apparatus wherein 'areciprocatmg part is .de-

signed automatically to actuate, 'or strikek epeated blows upon, a drilling, cutting,fhamymeringor chopping tool, said-reciprocating art being actuated by pneumatic pressure.

thas beenthe Special object-'ofimy-inventionto produce a simple and`A easily operated vdevice which shall eXhaust'the air under the compression as soon as its work has been performed and take ina fresh supply of air to'v be compressed'thereby preventing the-unjdue heating of the deviceV which would otherwise be occasioned by the maintenance within the system of a. lnearly "unchanging body of air, as in the so-called pulsating type of pneum'atically actuated tool.'

My invention consists, further and finally, in lthe feature combinations and details of constructiony hereinafter., described and claimed.

device may be best understood'by refv erence to the accompanying draw-ings in which i Fig. 1 is a side view, largely the air compressor.

Fig-."2 shows in longitudinal cross-section the tool-cylinder." v 1 Y 'Fig 3 showsin cross-section an lenlarged rdetail view of` thetrigger-valve inv the `toolcylinder.

in section, of

Fig. 1. Y y f Fig. 5 shows the construction and arrangement of the metallic and fabric packing'rings in the stuffing box of the air compressor.

Fig. 6 is a sectionalfront view ofthe air compressor. Y Y l y Fig. 7 is a sectional viewon line 7-7 of Fig. 6'. Y

Fig. Seis a cross-sectnin of the oilpump.

Fig. 9 is a cross-section on line 9 9v of Fig. 2.

Fig. 10 is across-section on line 10-10- of Fig. 2.V Y

Referring now more specifically to the drawings, 1 is the base-casing of the air conipressorwithin which isthe crank-shaft 2 whichy carries a fly-wheel 3.l rFhe crankshaft 2 actuatcs the crank 4 which is connected by thel wrist-pin 5 with the sleeve 6 f which is slidably mounted within asmallcylinder 7 which projects `upward within base. of the compressorAv cylinderY 8 (see Y Mounted on a' transverse web 9 within the sleeve6 isga piston rod 10 which `paSSCs through a stuffing-box 11 mounted in the top The stuffing-box 11 of the small cylinder 7. is packed with alternate Vrings 11.a ofcast `iron andV canvas, 11", the iron rings 11a being split. as shown in Fig. 5, so that they may'besprung closely7 about the piston-rod l 10. The piston-rod l() bears the piston 12 which has a closesliding fit within the cylinder 8.

The crank-shaft 2 has fast thereon a gear 13 which meshes with a gear 14Vfast on the end of a ldrive shaft 15 which may be actuated `by a motor or other convenient source of power. l

Fast on the shaft 2 is'another gear 16 which meshes with an intermediate ,gear 17 on shaft 18 mounted in base 1. The gear 18 meshes with and actuates a gear. 19 fast on shaft 2O mounted on a bracket 21 which is attached by screws 22 to thebase 1. `The shaft 2O is 'provided with' a fly-wheel 23 which bears an off-set crank pin 24 on' which is mounted the 'crank 25. rThe crank 25` is attached by means of a wrist-'pin26 to the slide-valve 27 which is arranged Vto slide Y l over the flattened outer surface of thead- VFig. 4 is a cross-section on line .4-4of v jacent exteriorV of the cylinder v8 iwhich is ing 33 is covered by three sheets of line wire gauze 35 forming an air-strainer. (See Fig. 6.)Y

The compressor cylinder 8'is provided with outlet ports 36 and 37 into which screw nip- V ples 38 and 39Vto which are attached respectively hoses 40 and 41. Between the outlet provided with `integral lateral guide ways 28 ports r36 and 37 is an opening 42 provided dust of the tool is never drawn into the tool cylinder so as to become' a'destructive agent. 'IheV spring 73 serves to assist the recoil of the hammer 65, upon its impact with they tool 71, so as to permit the compressedair to exert its influence to further elevate it.

When the trigger is in normal position the valve 76 is in the position'illustrated in Fig. 3, closing theV top of the tool cylinder 63 to the entrance of air from the pipe 40. Pressure impulses coming from pipe 40 are exhausted through the port 7 9, while those coming kfrom pipe 41 are exhausted through the passage 7 0, the hammer 65 remaining at rest near the top of the chamber 64.

The force of the impulses ofair through pipes 40 and 41, and consequently the power of the hammer 65, may be diminished in varying degree by turning the plug sov as to back'it more or less off itsseat 43, (see Fig.

4), thereby permitting some ofthe air under pressure, alternately on each side o-f piston 12to escape through the passage 45.

The plunger 48 of the oil pump is reciprocated by the downward thrust of the lug 51von the reciprocating valve plate 27, and the upward thrust of the spring 49. Upon the upward thrust ofthe plunger 48 the ballvalve 54 lifts and admits oil to the, pumpbore 47 whence it is expelled, by the downward thrust of the plunger, into the passage 57. The ball-valve 59 lifts automatically to permit the outward iow of oil and seat-s automatically on the suction stroke of `the plunger 48. Y l v Y MyV device possesses the great merit of keeping always cool, no matterV what the speed of operationmay be., because no constant pressures are maintained Vanywhere in the system and there is a constant passage through thevsystein of freshly intaken, cool atmospheric air. cause of its flexibility, and simplicity itc-an safely be operated at high speed. l

Having thus fullyV described my invention what I claim is :4- n i 1. In a. device of the character specified the combination of a tool-cylinder provided with an exhaust port located intermediate the Vends thereof, a. tool-piston in said tool-cylinder adapted to close said exhaust port during a part of its movement, an air-compressor, a passage connecting said air compressor with the front of said tool-cylinder, and a second passage connecting said air compressor with the rear of said tool-cylinder, said passages being at all times free and unobstructed while said device is in operation and said air-coinpressor being provided with .y

two compression chambers each of which connects with one of said passages and each of which is provided with a valve adapted to be opened upon the suction stroke of a i compressor piston and'closed upon the pressure stroke thereof, said exhaust port in said Because of this, and'be-y tool-cylinder being ofr'size suilicient to fully passage from thefront of said compressorcylinder to the rear ofsaid tool-cylinder and a passage from the rear of said compressor-v cylinder to the front of said tool-cylinder, said passages being at all times free and unobstructed while said device is in operation, intake ports in said compressor-cylinder, there being an intake port on each side of said compressor-piston, valves arranged to control said ports, said valves being adapted to` close at the start of the compression stroke thereof and open at the start of the suction stroke of said piston, said exhaust-port being of sizesuflicient to fully and kfreely exhaust the force of compression existing in said tool-cylinder when said exhaust-port is not l closed by said tool-piston.

3. In a device of the character specified the combination of a tool-cylinder provided with an exhaust port located intermediate the ends thereof, a tool-piston in said tool-cylini der adapted to close.l said exhaust passagey during a part of its'movement, a compressorcylinder, acompressor-piston in said compressor-cylinder, outlet ports insaid Compressor-cylinder, there' being an outlet port on each side of said compressor-piston, a passage from the front of said compressorcylinder to the rear of said tool-cylinder and a passage from the rear of said compressor-cylinder to the Yfront of said toolcylinder, said passages being at alltimes free and unobstructed while said device is in operation, intake ports in said compressor-cylinder, therev being an intake port on each side of said coinpressor-pistoii, valves arranged `to control said ports, said valves being adapted to close at the start vof the compression 4stroke thereof kand open at the start of the suction stroke of said piston, said exhaustport being of size suicient to fully and freely exhaust the force of compression existingr in said tool-cylinder when said exhaust-port is not closed by said tool-piston, a compression relief port in saidcompressor-cylinder, means forV closing said compression relief port, and means whereby` said closure means may be opened to a. varying degree. y

In witness whereof I have Ahereunto affixed my signature.

Y DANIEL L. OULTON. 

